diff --git a/Makefile b/Makefile
index 41eecd1..28b0cee 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ OBJ =\
 	lex.o \
 	lib.o \
 	memobj.o \
-	oo.o \
+	oop.o \
 	parse.o \
 	vfs.o \
 	vm.o
diff --git a/oo.c b/oop.c
similarity index 100%
rename from oo.c
rename to oop.c